Tire pressure - Focus Fanatics
Ford Focus Forum
HomeContact UsAbout UsGalleryDiscussion ForumsMarketplace


Go Back   Focus Fanatics > Ford Focus Racing Discussions > Autocross Racing

Autocross Racing The place to discuss information about autocross stats, tips and events. Track sanctioned events only.

Search This Forum | Image Search | Advanced Search    
Ford Focus Tire & Wheels FocusFanatics Merchandise

Reply
 
Thread Tools Display Modes
Old 11-19-2009, 12:28 PM   #1
jrpasmo
Focus Addict
 
jrpasmo's Avatar
 
Join Date: Jan 2004
Fan#: 2866
Location: Bratislava
What I Drive: 02Focus ZTW, 02Focus SVT

Posts: 1,302
FF Reputation: 5 jrpasmo Good Standing Member
Buy-Sell-Trade Rating: (1)
Tire pressure

Hi. I was reading tips for tire pressure and I tried it here in Europe. I don't know if AutoX in the US and here is different, but when I had 40PSI front, SVT has been understeer king. I was really slow....everybody here thought that I'm crazy to run such a high pressure. They were around 25PSI front . So now I'm like.....what !?!?!? Why, such a huge difference?


__________________
#4208/4788 Procharged SVT 10PSI : +-270/204 by Focus-Power,
N/A ZTW, 2.2 CRDI AWD Santa Fe MMRacing tuned
jrpasmo is offline  
    Reply With Quote
Sponsored Links
Advertisement
 
Old 11-19-2009, 11:30 PM   #2
WeeAsp
Resident Curmudgeon
 
WeeAsp's Avatar
 
Join Date: Jan 2007
Fan#: 42718
Location: NOVA
What I Drive: 2002 RED SVT Focus

Posts: 4,360
FF Reputation: 175 WeeAsp Excellent Standing Member WeeAsp Excellent Standing Member
Buy-Sell-Trade Rating: (0)
Quote:
Originally Posted by jrpasmo View Post
Hi. I was reading tips for tire pressure and I tried it here in Europe. I don't know if AutoX in the US and here is different, but when I had 40PSI front, SVT has been understeer king. I was really slow....everybody here thought that I'm crazy to run such a high pressure. They were around 25PSI front . So now I'm like.....what !?!?!? Why, such a huge difference?
The first question is "are you running street tires or competition tires?"

Assuming you are running street tires, the "rule of thumb" is that you start with 10 psi over stock and adjust from there.

If you are experiencing understeer, then I would recommend a few things:

1. Bump up the front tires in 1LBS increments until the car becomes "neutral" in handling

2. Run 1-2 LBS MORE in the rear tires than the front to increase oversteer and rotation

3. Adjust based on the course. Unfortunately, every course is different and you will have to adjust on the fly. Remember that the more dramatic change you make to the tire pressures = a more dramatic adjustment to driving style. This is not an easy thing to do in an AX environment with limited runs and time.

It only comes with experience.

The important thing to remember is to have fun. Don't be discouraged. The course, tire wear, environmental conditions (weather, surface, distance, etc.) play a key role in how well (or how poorly) you perfom.

In an AX environment, there is little room for error. So, start small and see what works, but keep in mind that even minor adjustments can result in a negative outcome.

I always like to walk the course and envision how I am going to approach a given gate and adjust the 10psi increase according to the most technical/difficult portion of the course.

Chances are, if you do well in THAT portion of the course, you will be able to adjust to the rest with relative ease.

Good Luck!
__________________
FORMER Avenging Moderator of the Apocalypse and Leader of the Axis of Oversteer

"I live with fear every day and sometimes, she lets me race."

2002 SVT Focus... Stock
WeeAsp is offline  
    Reply With Quote
Old 11-20-2009, 12:36 AM   #3
jrpasmo
Focus Addict
 
jrpasmo's Avatar
 
Join Date: Jan 2004
Fan#: 2866
Location: Bratislava
What I Drive: 02Focus ZTW, 02Focus SVT

Posts: 1,302
FF Reputation: 5 jrpasmo Good Standing Member
Buy-Sell-Trade Rating: (1)
Thx a lot. Now I have 4 months to prepare for the next season ;-)
__________________
#4208/4788 Procharged SVT 10PSI : +-270/204 by Focus-Power,
N/A ZTW, 2.2 CRDI AWD Santa Fe MMRacing tuned
jrpasmo is offline  
    Reply With Quote
Old 11-20-2009, 08:39 AM   #4
WIZARD Racing
Focus Jr. Enthusiast
 
Join Date: Apr 2009
Fan#: 63978
Location: Amesbury, Mass, Afghanistan
What I Drive: 2002 Pitch Black SVTf

Posts: 34
FF Reputation: 1 WIZARD Racing Good Standing Member
Buy-Sell-Trade Rating: (0)
Great advice!

Experience is the key. I've shown up to an autocross, looked at the tires (ok, they have some air in them), and won my class, on street tires. But that's a LOT of seat time. Before that, I actually found that my SVTf and I agreed on 30psi all around and just left the tires there for the street.

Your pic shows you on a track? Do you do track days as well as AutoX?
Running on a road course at higher speeds the tires will heat up more and usually gain up to 10psi. I start out around 28 - 30 psi (depending on weather and such) and it is sometimes around 40psi after 20 laps.
Adjustments are similar to autoX, but once you found your 'zone', half pound adjustments might be all you need.
__________________
Buddy
WIZARD Racing Team
#58 ita (1991 Escort GT)
2002 SVTf
www.wizardracing.net
WIZARD Racing is offline  
    Reply With Quote
Old 11-20-2009, 09:47 AM   #5
jrpasmo
Focus Addict
 
jrpasmo's Avatar
 
Join Date: Jan 2004
Fan#: 2866
Location: Bratislava
What I Drive: 02Focus ZTW, 02Focus SVT

Posts: 1,302
FF Reputation: 5 jrpasmo Good Standing Member
Buy-Sell-Trade Rating: (1)
Yes I'm doing both.
I agree with that 30PSI on street tires....event before this one I had around 30 and managed to finish second in my class. This year I did 6-7 autox, one hill climbing and one road track events.
__________________
#4208/4788 Procharged SVT 10PSI : +-270/204 by Focus-Power,
N/A ZTW, 2.2 CRDI AWD Santa Fe MMRacing tuned
jrpasmo is offline  
    Reply With Quote
Reply

Bookmarks & Social Networks
-->
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -5. The time now is 03:55 PM.


Copyright 2002-2014 FocusFanatics.com. All Rights Reserved : Terms of Use : Privacy Policy : Advertise Information

Focus Fanatics Ford Focus Forum offers many fun ways for you to engage with other Ford Focus Owners from across the world. Whether it be about the aftermarket performance modifications, technical how-to's, European tuned suspension or awesome fuel economy similar to the Acura TLX or Fiesta ST. You can find all Ford Focus and Focus ST related information here. Join our Ford Focus discussion forums and chat with local Focus enthusiasts in your area.